Brandon Bryant, now 27, served as a drone operator from 2006 to 2011, at bases in Nevada, New Mexico and in Iraq, guiding unmanned drones over Iraq and Afghanistan and taking part in missions that he was told led to the deaths of an estimated 1,626 individuals. In an interview with NBC News, he provided a rare first-person glimpse into what it's like to control the controversial machines that have become central to the U.S. effort to kill terrorists.